Refs #31351 -- Made partial constraints tests use required_db_features.

This will notably silence the warnings issued when running the test
suite on MySQL and MariaDB.

tests/constraints/models.py

@@ -41,6 +41,16 @@ class UniqueConstraintProduct(models.Model):
     class Meta:
         constraints = [
             models.UniqueConstraint(fields=['name', 'color'], name='name_color_uniq'),
+        ]
+
+
+class UniqueConstraintConditionProduct(models.Model):
+    name = models.CharField(max_length=255)
+    color = models.CharField(max_length=32, null=True)
+
+    class Meta:
+        required_db_features = {'supports_partial_indexes'}
+        constraints = [
             models.UniqueConstraint(
                 fields=['name'],
                 name='name_without_color_uniq',

tests/constraints/tests.py

@@ -5,7 +5,10 @@ from django.db import IntegrityError, connection, models
 from django.db.models.constraints import BaseConstraint
 from django.test import SimpleTestCase, TestCase, skipUnlessDBFeature
 
-from .models import ChildModel, Product, UniqueConstraintProduct
+from .models import (
+    ChildModel, Product, UniqueConstraintConditionProduct,
+    UniqueConstraintProduct,
+)
 
 
 def get_constraints(table):
@@ -207,15 +210,25 @@ class UniqueConstraintTests(TestCase):
         with self.assertRaises(IntegrityError):
             UniqueConstraintProduct.objects.create(name=self.p1.name, color=self.p1.color)
 
+    @skipUnlessDBFeature('supports_partial_indexes')
+    def test_database_constraint_with_condition(self):
+        UniqueConstraintConditionProduct.objects.create(name='p1')
+        UniqueConstraintConditionProduct.objects.create(name='p2')
+        with self.assertRaises(IntegrityError):
+            UniqueConstraintConditionProduct.objects.create(name='p1')
+
     def test_model_validation(self):
         msg = 'Unique constraint product with this Name and Color already exists.'
         with self.assertRaisesMessage(ValidationError, msg):
             UniqueConstraintProduct(name=self.p1.name, color=self.p1.color).validate_unique()
 
+    @skipUnlessDBFeature('supports_partial_indexes')
     def test_model_validation_with_condition(self):
         """Partial unique constraints are ignored by Model.validate_unique()."""
-        UniqueConstraintProduct(name=self.p1.name, color='blue').validate_unique()
+        obj1 = UniqueConstraintConditionProduct.objects.create(name='p1', color='red')
-        UniqueConstraintProduct(name=self.p2.name).validate_unique()
+        obj2 = UniqueConstraintConditionProduct.objects.create(name='p2')
+        UniqueConstraintConditionProduct(name=obj1.name, color='blue').validate_unique()
+        UniqueConstraintConditionProduct(name=obj2.name).validate_unique()
 
     def test_name(self):
         constraints = get_constraints(UniqueConstraintProduct._meta.db_table)